C. Schmidt, in the work cited above (pp. XVIII-XXVI), on the basis of similarities with the Pistis Sophia and internal criteria, believes he has identified the two books of J. in a papyrus codex, written in Coptic (Sahidic dialect), in the Bodleian Library in Oxford, known as the Codex Brucianus, named after the Scottish explorer J. Bruce who acquired it in Egypt on the recommendation of Woide. E. C. Amélineau published a French translation of it in Paris in 1891 (Notice sur le papyrus gnostique Bruce, texte et traduction). C. Schmidt, comparing Woide’s transcription with the original text, published a more accurate annotated German version in Texte und Untersuchungen, 8, 11, and then in 1905 in the work cited above (pp. 257-329). In the latter, he argues that the two books of J. were written in Greek in the first half of the 3rd century by the Gnostic sect of the Barbelites (cf. Irenaeus, I, 29-31; PG 7, 691-704).
The first book is entitled Book of the Great zzzz zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz (J. A. Corblet, 3 (1950), pp. 71-147).